Direct transmission: Patients sneezing, coughing, talking droplets, and exhaled gas in close contact with direct inhalation can cause infections.

Aerosol transmission：Droplets mix in the air to form an aerosol, which causes infection after inhalation

Contact transmission：The droplets are deposited on the surface of the article. After touching the contaminated article with your hand, then contact the mucous membranes such as the oral cavity, nasal cavity, and eyes, causing infection.

Fecal-oral transmission：Fecal-oral transmission is when live viruses are present in the faeces of the protoviral host, and inadequate sanitation facilities and poor sanitary habits, pathogens enter the newly infected person through the mouth.

In other words, untreated excreta or sewage may pollute the water source, and people may become infected when they drink such water;

Or when flushing the toilet, the large spray force during flushing allows water and feces to mix to form an aerosol that rises to the air and spreads to others;

It is also possible that when hands are not washed after passing the stool, the pathogen can be transmitted to others through daily items such as hands, food, clothing, etc., and then spread into the body from the mouth or through contact, causing infection.